A story that repeats itself can appear redundant or poorly edited. Nobody enjoys reading the same thing repeated over and over, whether in dialogue, description, or foreshadowing. Even in real life, such things can grate on the nerves.
The story elements we use determine whether our readers will laugh, cry, or be sickened or excited. Tone is the emotion you want to convey to your reader. How you want them to feel when they read your novel. It affects the story’s mood and draws attention to your word choice. Portraying the wrong emotion can turn a horror story into a comedy or a romance into a thriller.